[opus] NaN sanity check not present in tree.

[Yves Gerey]

Hi, I'm still Yves.

This other fix
<https://chromium-review.googlesource.com/c/chromium/src/+/1061499/> never
made it to opus repository.

It seems safe and sane enough to be applied to opus master branch.
What do you think?

-- 
Warm regards,
Yves
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